FEM: Result object labels are truncated for low times/eigenvalues

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Problem description

For low times (transient or nonlinear analyses) and eigenvalues (frequency or buckling analyses), the labels of the results pipeline and CCX results objects don't reflect those times/eigenvalues anymore:


The example above is for times from 0.0001 to 0.001 s. Here's what it looks like for larger times (0.1 to 1):


Forum thread: https://forum.freecad.org/viewtopic.php?t=87443

Increasing the number of digits displayed by those labels is one way but it would be good to also add another property to those objects that would contain the full value without such a truncation.

The _Number of decimals_ preference doesn't affect this.

@marioalexis84 FYI

### Full version info

```shell
OS: Windows 10 build 19045
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37213 (Git)
Build type: Release
Branch: main
```

### Subproject(s) affected?

FEM

### Anything else?

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct